44542440421 has 2 divisors, whose sum is σ = 44542440422. Its totient is φ = 44542440420.

The previous prime is 44542440419. The next prime is 44542440517. The reversal of 44542440421 is 12404424544.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39595428196 + 4947012225 = 198986^2 + 70335^2 .

It is a cyclic number.

It is not a de Polignac number, because 44542440421 - 2¹ = 44542440419 is a prime.

Together with 44542440419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44542410421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22271220210 + 22271220211.

It is an arithmetic number, because the mean of its divisors is an integer number (22271220211).

Almost surely, 2^44542440421 is an apocalyptic number.

It is an amenable number.

44542440421 is a deficient number, since it is larger than the sum of its proper divisors (1).

44542440421 is an equidigital number, since it uses as much as digits as its factorization.

44542440421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81920, while the sum is 34.

Adding to 44542440421 its reverse (12404424544), we get a palindrome (56946864965).

The spelling of 44542440421 in words is "forty-four billion, five hundred forty-two million, four hundred forty thousand, four hundred twenty-one".